Best Worldwide:NH Hotels Started in Pamplona, Spain in 1978, NH has grown to become one of the top 20 largest chains in the world, with more than 400 properties in 26 countries, from Andorra to Uruguay (most are concentrated in Europe and South America). The look varies from one hotel to the next, but many are set in historic buildings with original architectural details and filled with stylish, modern furnishings: solid, neutral-hued linens on the bed and abstract art on the walls. NH also often has several hotels in the same destination, so it's worth it to check out all your options for the best rate and location. Sample rates:from $120 at the Hotel NH Musica, Amsterdam; from $114 at the Hotel NH Anglo American, Florence; from $143 at the Hotel NH Tango, Buenos Aires. nh-hotels.com Properties: 400-plusAv…